diff --git a/src/main.cpp b/src/main.cpp
index a9f43cb..7f528ec 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -15,6 +15,9 @@ int main(void) {
 
 	log::debug << "Hello world!" << mtl::endl;
 
+	float cos_PI_2 = std::cos(M_PI_4);
+	fixed cos_PI_2_fx = cos_PI_2;
+
 	ruleset_t rules;
 
 	try {
@@ -23,8 +26,8 @@ int main(void) {
 		token_id_t walk_petal_length = rules.add_token(token_type_e::walk, 8);
 		token_id_t walk_petal_side = rules.add_token(token_type_e::walk, 4);
 
-		token_id_t rotate_axiom = rules.add_token(token_type_e::rotate, M_PI_2);
-		token_id_t rotate_petal = rules.add_token(token_type_e::rotate, M_PI_2);
+		token_id_t rotate_axiom = rules.add_token(token_type_e::rotate, cos_PI_2_fx);
+		token_id_t rotate_petal = rules.add_token(token_type_e::rotate, cos_PI_2_fx);
 		token_id_t rotate_branchr = rules.add_token(token_type_e::rotate, branch_angle);
 		token_id_t rotate_branchl = rules.add_token(token_type_e::rotate, branch_angle * -2);